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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2da5cff84be551b1edd301664f78b11adf1f1c83c0d8620a93c0671800c682d9' 
  AND token = 'C48rmCSdytUKEfZuElRCrj4oC3eXi5qA8sJAJVV1DLQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}